Videos Only Play When Muted

Hello, just found this forum and hopefully someone can help me with a frustrating problem

I'm running Windows 10, Version 10.0.19044

Video's have always been fine until just recently, when I realized they were sluggish, stopping, moving in slow motion, etc, yet as soon as I mute them they work fine. Sound on, won't work properly. Sound off, works properly

I use Firefox, but have run video's on two other browsers and the problem is still there

All the updates and drivers for the players I use and tried are up to date

Any idea's?

Thank you in advance

Not very computer literate. Is this what you mean?

Device name Handman777
Processor Intel(R) Core(TM) i7-7700 CPU @ 3.60GHz 3.60 GHz
Installed RAM 16.0 GB
Device ID 53C3EA38-A0B6-4BA1-BAC1-A51520F282C9
Product ID 00325-95802-49676-AAOEM
System type 64-bit operating system, x64-based processor
Pen and touch No pen or touch input is available for this display

What are the "players I use" ?